Fermions (for example electron, neutron, proton, and neutrino) must obey Pauli's exclusion principle which means that they cannot exist in the same quantum state at the spacetime point. On the other hand, bosons (for example photons) obey the principle of superposition which means they can occupy the same quantum state anytime anywhere. This had been applied in the science and technology of LASER (light amplification by stimulated emission of radiation).Originally Posted by Mikal


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